This paper uses the ISO/TS14067: 2013 standard to develop model to examine the carbon footprint of a public transportation.
The carbon footprint of the service life cycle (load factor 100%) of a SMR bus is 0.0115 kg CO2,e.
SMR has the smallest carbon footprint (0.0115 kg CO2,e).
The fuel price is the key factor of using hydrogen scooters.